Update- video re: enlarging with compasses and triangle

[cliffrod]

Originally Posted by cliffrod

Bart, the methods I will demonstrate this Friday at Redneck Roundup ( & then post to video for all here asap) are what I use to enlarge 2D patterns. No computers, significant expense or typical limiting things like plotter size, just the time to do it. Very Simple and very accurate. Detail level is dependent upon how many points are replicated.

If you are enlarging by a whole integer multiple (3x, 4x, 10x) it is somewhat more simple because you only need a straight line and calipers to calculate and capture new dimensions to apply to the pattern. That is part of what I'll demonstrate as well.

The problem often encountered if that accuracy OR inaccuracy is also multiplied by the same factor. Little models/patterns have to be perfectly accurate to enlarge in big steps. I was trained to enlarge by a factor <2 if possible each time, correcting as needed before the next enlargement unless the model/pattern is really good. This is not always practical, but this is still SOP for some of the best foundry and portrait sculptors with whom I work.

These methods, which work very easily for 2D enlargement, were actually taught to me to use for accurate 3D enlargement. That is not as simple, well beyond the scope of a brief workshop and probably not as relevant here. I realize many here will not use these methods in lieu of modern technology. Even so, they provide a means to easily double check the accuracy of work, whether 2D or 3D.

Noticed this in a thread just commented on today and figured I should update about my nearly year-old statements-

Video is not finished but the effort has not been abandoned. I was not satisfied with the video we captured at 2016 RR. Bill Longyard and Jim Russell were very gracious with their help shooting video. However, the details of the triangle, strikes and such were simply not visible on the RR video. My fault, not theirs. Lighting, materials, etc are being revamped or I'll need some basic video animation but so far have not learned that yet. very low tech here.

I'm working to apply this most readily to 2D and also trying to develop/proof the easiest method of the larger steps (non-integer or decimal ratios beyond 2X) for those wanting to do so when appropriate. For certain efforts, it's viable while other times too much information is lost.

So, in a nutshell, I'm still working on it. As with many things, it's more challenging to explain it concisely than to simply do it. And time flies...

In the meantime, anyone with interest or questions is welcome to call or email.

[cliffrod]

After a long time planning, I’ve produced the first two videos about the tools and process of enlarging or reducing with compasses and triangle. These are part of my Virtual Stone Carving Apprenticeship video series on my YouTube channel. These two videos are probably most relevant to people here. One more video, showing the construction of a triangle for a pending job will be uploaded tonight and I will add the link to this post.

In terms of metal working, I have found application for this with buck building and development of patterns. I presented this at the Redneck Roundup several years ago. using this process, you can manually manipulate dimensions of a 2D or 3D item with great accuracy and no numeric calculation. For those who do not do CAD or simply want to know how it is done, this is how it is done. The mathematical/geometrical function presented is how such calculations are actually done within a computer program.

There will be more videos produced showing use of this process on a pending stone project after it arrives in studio, hopefully in the next 2-3 months. Right now, the triangle will be used to guide development of a properly scaled clay maquette for that project. Those videos will be posted to my VSCA playlist, so interested people may want to subscribe. That will likely be of less interest than the basic theory.

https://www.youtube.com/watch?v=rJIsrYzqiEg

https://www.youtube.com/watch?v=yjZo5DqnF3w

[BTromblay]

Originally Posted by cliffrod

After a long time planning, I’ve produced the first two videos about the tools and process of enlarging or reducing with compasses and triangle. These are part of my Virtual Stone Carving Apprenticeship video series on my YouTube channel. These two videos are probably most relevant to people here. One more video, showing the construction of a triangle for a pending job will be uploaded tonight and I will add the link to this post.

In terms of metal working, I have found application for this with buck building and development of patterns. I presented this at the Redneck Roundup several years ago. using this process, you can manually manipulate dimensions of a 2D or 3D item with great accuracy and no numeric calculation. For those who do not do CAD or simply want to know how it is done, this is how it is done. The mathematical/geometrical function presented is how such calculations are actually done within a computer program.

There will be more videos produced showing use of this process on a pending stone project after it arrives in studio, hopefully in the next 2-3 months. Right now, the triangle will be used to guide development of a properly scaled clay maquette for that project. Those videos will be posted to my VSCA playlist, so interested people may want to subscribe. That will likely be of less interest than the basic theory.

https://www.youtube.com/watch?v=rJIsrYzqiEg

https://www.youtube.com/watch?v=yjZo5DqnF3w

Hi Clint,

I started watching the video and it looks good so far. Next time we are together, I would like to do some buck work with you.

Good stuff.

Bill

[cliffrod]

Originally Posted by BTromblay

Hi Clint,

I started watching the video and it looks good so far. Next time we are together, I would like to do some buck work with you.

Good stuff.

Bill

Thanks, Bill. I'll work with you anytime I can. Your talent, skill and perspective really blows me away. Any chance of it rubbing off on me is a welcome opportunity.



Here's the 3rd installment of the Compass & Triangle video, showing the construction and first use of the triangle.



https://www.youtube.com/watch?v=6p07NQMxXRs


To apply this to a 2D pattern- such as the individual station of a buck or photograph- I've found the easiest method is to install a nail with string attached within the 2D pattern. Then pull string tight & secure to capture & apply original (model) and calculated (job) dimensions along the tightly pulled string. It makes scaling a pattern or object in a picture very simple.



For convenience when doing larger work, the scale of initial enlargement can be a basic ratio or fraction (1/2, 1/3, 1/5. etc) which can then be taken to the larger final dimension by simply walking the caliper along a straight line a corresponding number of times to produce the desired final dimension or scale. This can avoid the need of having a triangle that is 15-20 feet long to limit literally miles of walking back & forth during the process.

[JimRussell]

Hi Clint,

I saw (and recorded) your demo at the RNR a few years back. That's a great lesson for metalshapers! Thanks.

[cliffrod]

Originally Posted by JimRussell

Hi Clint,

I saw (and recorded) your demo at the RNR a few years back. That's a great lesson for metalshapers! Thanks.

You’re welcome, Jim. Hopefully these videos are an improvement over that presentation. Presenting the triangles more concisely has been on my mind ever since the redneck roundup.

[Manza]

hope this is usefull
https://www.youtube.com/watch?v=UpK7hkth-n0
Pantograph Animation
https://www.youtube.com/shorts/w6y4I4OHiok
Woodwork Enlarge scale
https://www.youtube.com/watch?v=7xq9RKaI3VY